Stability of interfaces for seniors: Elder users generally have slower reactions, and also they shall not be distracted without a reason. The designers should limit the usage of automatic system action on a website, such as auto-changing some fields in an input form, or automatically taking user to a new location (page) on a website. The usage of distracting elements, such as animated .gif pictures or aggressive Flash animation should be also limited if possible. This strategy is somehow contrary from design recommendations for regular users, who indeed may benefit from automation of some tasks and re-directing at web pages.